Product are modified wave inverter charge sine wave inverter, can make modified wave inverter 3000W, etc ...,as modified pure sine wave inverter.First, remove the power tube after correction inverter, and then look at thecorrection inverter have how many transformers , look at the transformer secondary circuit isconnected in parallel or in series, and then add the transformer parameters, modified wavetransformer secondary is parallel , In each transformer secondary plus 16 laps.The secondary of the modified transformer is a series type, plus 8 laps per transformersecondary. Then in the correction transformer which transformer one empty foot plus a smallvoltage parameter, the small voltage parameters using 0.6 copper wire, in the transformerinside around: 5 laps, the small voltage is linked AC: 16V position. (Note: Do not open the magnetic ring when the add transformer with the parameters) After the addition of transformerparameters, we must correct the modified wave inverter high voltage capacitors in exchangefor 220UF / 450V, Remember: modified wave inverter high-voltage capacitor has apositive feedback Resistance, the resistance is a few hundred K, but also need to change a largeresistance, or the voltage will not rise. After testing the voltage of high-voltage capacitor (positive/negative) voltage is DC380V,the test voltage is normal, the use of cable to the sine wave after the board, after the board output voltage: AC220V / 50HZ,the output waveform: pure sine wave.